BHAKTHA , S.n.b.

The presence of scatterers, for long, had been considered detrimental for the growth of photonic devices. Hence, a great care is taken during the fabrication of fibers and optical devices to avoid scatterers, which may lead to a loss of signal strength and efficiency of the device. However, random scatterers have become a topic of immense...

Rare earth (RE) doped silica-based optical fibers with transparent glass ceramic (TGC) core was fabricated through the well-known modified chemical vapor deposition (MCVD) process without going through the commonly used stage of post-ceramming. The main characteristics of the RE-doped oxyde nanoparticles namely, their density and mean diameter...

We report on the fabrication of Eu3+-doped SiO2−SnO2 low-loss (0.8 dB/cm at 632.8 nm) glass-ceramic planar waveguides, fabricated by the sol−gel technique and dip-coating processing. The effects of heat treatments on the growth and evolution of SnO2 nanocrystals in the matrix were investigated using different spectroscopic tools. In situ...

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(100-x) SiO2–x SnO2 (x from 12 to 60 mol%) glass–ceramic thin films have been prepared by the sol–gel processing method, obtaining high SnO2 concentrations (up to 60 mol%) for the first time. Using an appropriate thermal process, SnO2 nanocrystals were nucleated in the glassy silica matrix, providing optical waveguides for x ≤ 30 mol%. M-line...

We report on the photorefractive properties of tin-silica slab waveguides, deposited on vitreous-SiO2 by means of sol-gel dip-coating technique. The basic composition of these amorphous binary systems is 75 SiO2 - 25 SnO2 mol% with 1 mol% of Eu3+ ions. Europium was chosen as an optical probe of the glass structure. These guiding structures...

The possibility to confine the light in optical planar structures represented the milestone for the development of integrated optical devices in different application areas, such as communications and sensing. In particular, rare-earth (RE) doped planar waveguides demonstrated to be an interesting solution in the realization of integrated...

This work presents a short review of the activity performed in developing sol–gel-derived SiO2–HfO2 and SiO2–SnO2 glass–ceramic waveguides activated by Er3+ and Eu3+ ions, respectively. Fabrication by top-down and bottom-up techniques is reported and optical and spectroscopic assessment of glass ceramic waveguides is discussed. Luminescence...